How much potential energy is stored on a stone kept on the earth surface? Why?​

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The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?